Malicious PDF — malware analysis report

Static analysis result for SHA-256 90205a25fa5441da…

MALICIOUS

PDF

74.8 KB Created: 2021-07-02 23:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef15e99797d7bd1e6454cbbea90c1629 SHA-1: 332fbf3b8c62b59dc6276bf16a9a8e9398ce569b SHA-256: 90205a25fa5441da540db78720ff5d5eef283676cc3e55ce891212a8fac747c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used to redirect users. The PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160782b8707547---nuwogedokuxezamimomitib.pdf
    • https://adepotcustom.com/UploadFiles/file/20210427221249183.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/901c608dd626bfd2dd09f6b12a735175/xalevanafi.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c66088b7590---18120794917.pdf
    • http://classofjoy.com/KK/userfiles/files/xalexogewodawoto.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bee945dea78---22983688379.pdf
    • http://oryginalnedekoracje.pl/userfiles/file/wutorixewaje.pdf
    • http://www.prodomasa.com/ckfinder/userfiles/files/25835486068.pdf
    • http://prinsart.ro/uploads/files/82251278104.pdf
    • https://biocoils.com/img/file/4420576597.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/21337caecd8270cf18a70608bd8e74b9/kokoji.pdf
    • http://clinicaveterinariabilancino.it/userfiles/files/99803009675.pdf
    • http://almar-bus.pl/userfiles/file/begubifixizod.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40152f088c---2457780723.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/2208e2c443249e3e9570126bbfc657ab/43944975958.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/a70d518205a5940aedba7795e10931f9/86197494176.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/8c2657d6012bd37e3a91e085aaa9335d/81603563604.pdf
    • http://cycling-software.com/files/file/58374966444.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/26610de038803b658e791a946d4666a9/kikutovefitup.pdf
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/xezuw.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1bda1f97c---jenugibaxoneruri.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16097188a5d904---68655505435.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/b843d51a41bc91c7347537ef7f932d4a/89021966674.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607bea319deec---rufinotiwowibalasaseno.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c2aa6b2b755---19434530704.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=rand+to+bdt
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c348.bin
f2077535a36446c268e24e06b41a6783abee9a307ab3f62f1e167bbfad765100
pdf-font-stream PDF embedded font (sfnt) at offset 0xC348 17032 bytes
font_01_sfnt_off0000effa.bin
3f44046b51b2cd2ed273f54130e40dbfc3475812f2c5cd270e8e8dccc8793a59
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFA 9888 bytes
font_02_sfnt_off000105df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105DF 16792 bytes